Impeovement in device fob geinding cutleey



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IMPRDVEMBNT IN DEVICE FOR GRINDIN G GUTLERY.

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TO A LL WHOM IT MAY CONCERN: i l

Be it known that I, JONAS P. CURTISS, of New Britain, county'o'f Hartford, and State of Connecticut, have invented certain new and useful Improvement in Device for Forming and Finishing the Edges of Knives, dtc. and to enable others skilled in the art to make and -use the same, I will proceed to describe by referring to the drawings, in which the same letters indicate like parts in each of the figures.

,The nature'of this invention will be understood frornthe specification and drawings.

The object desired to be attained` by this invention istofaoilitatein the execution ofthe grinding or shaping process, and to keepthe grinding-surface of the stone perfectly true to act upon work presented to its action by a gauge.

lI rst construct a framework in front of a revolving grindstone. Upon this frame I arrange another sliding frame or bed, so that it may be adjusted, from time to time, closely tc the action of the stone. Near the edge of this adjustable frame, and next to the edge of the stone, I arrangeguide-pins, upon or against which a former. stock works, to give the proper shape' to the blade of a knife, or other tool or instrument which it may be employed for grinding. This former is arranged in the under side of the stock, in or to which thetool, knifehlade, or other article, is held by means of screw-cams or`other mechanical equivalents. In the accompanying drawings- Figure 1 represents a bed-plate, which is designed to be arranged upon framework lin front of a grindstone,

so that it will, when in use, slide in a line towards or from the grindstone, and so that'its nearness thereto 'can be easily and readily adjusted according to the wear of the stone, l y Y Figure 2 is a side view ofthe stock in whichl the article desired to begrorund into shape'is placed and held, a top view of which is shown in iig. 2. v v A- a is a sliding bed-plate, arranged upon ways, and adjusted by means of screws or their mechanical equivalents. c are pins, arranged in a parallel line upo n and near the edge of the sliding adjustable bed a". d'is a pattern-stock, provided with a groove in i-ts under side, the shapeuof which is shchas to present the article held thereon to thc action of the stone, so as to produce the required shape. e are joint elevations, formed on each side of the stock. fis a finger-bar, secured between the elevations e by a pin, and having a screw or eam,f, arranged in the back end thereof, for the purpose'of firmly depressing the article between it and the stock, while the grinding is being performed. h are screws, whichare turned firmly against the edge of the bladesor tang of a knife-blade, while the grinding is performed. The groove-stock d is placed upon the centre-pin c, so that, when 'turned in one direction against the pine', it (the pin c') will enter the groeve, formed in the under side of the stock d, through a side slit, z', and, when turned to the left, or in the opposite direction of the first, against the pin c, it will enter the groove through the slit z".

The table or sliding bed-plate a is arranged upon ways, and its position relative to the actiont-ol'` the stone is graduated or regulated by screw-gauges or their mechanical equivalents.

Now, when the above mechanism is prepared, and the blanks-are in readiness, the workman placesone or i more in the clamp-stock, and presses the stock, with its bed, gradually to the action of the stone, and'moves the-- stock d, rcstingagainst the pins, in a line parallel with the grinding-surface of the stone, till one'cdge of thebladesV is ground to the desired pattern or shape; then, turning the stock` steadily in the opposite direction about'a half circle upon the pin c, will produce a true rounded end to the blades, and then, by moving it (the stock) back vupon the pins c, the desired pattern or shape will .be produced. Thus several blades can be ground into the desired pattern by one operation, and of uniform shape, and atthe same time the stone is kept inperfcctly true working order, which is a great desideratum in grinding or shaping knives or other like articles.

I believe I have thus shown the nature, construction, and operation of this device, so as to enable others skilled to make and use the same therefrom.

What I claim, therefore, and desire .to secure by Letters Patent, is- A device for forming and fmishing'the edges of knives, Spc., substantially as described.

JONAS P. CURTISS. [a s jl Witnesses:

N. C. WILDRR, JEREMY W. BLISS. 

